Miss Silver Comes to Stay — Patricia Wentworth

When James Lessiter returns to Lenton after many years to claim his family estate, his reappearance opens old wounds never healed. Then he is found bludgeoned to death by a fire poker and the suspects are almost too numerous to count. From the jilted girlfriend, to the widow in the guest house, to an angry husband, each one has a long-standing grudge against the selfish scion--but only one has the urge to murder. Thank heavens Miss Silver is in town visiting a friend. The culprit is only a few questions from discovery.